{
  "abstract": "In this letter, we demonstrate that employing the Lens Aperture as a Knife-Edge (LAKE) with two identical LEDs has the distinct advantage of obtaining schlieren images along two cutoff orientations. It is possible to control LED brightness to obtain a desirable weighted sum of both horizontal and vertical schlieren cutoff images on each camera frames. Powering the LED sources by an affordable and programmable Arduino board enables a rapid switch between the horizontal and vertical schlieren cutoff that is exactly synced to the camera frames, resulting in crosstalk-free schlieren image sequence. Furthermore, with a little postprocessing, this monochrome image series can be easily transformed into a colorful sequence of bidirectional schlieren images.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Optics Letters Vol. 51, Issue 21, pp. 6127-6130 (2026)",
  "arxiv": "2610.04340",
  "author_total": 2,
  "authors": [
    {
      "name": "Vimod Kumar"
    },
    {
      "name": "Manish Kumar"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cw45xqqtj6ydd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.04340",
  "fulltext_url": null,
  "id": "cw45xqqtj6ydd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.04340",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.04340",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cw45xqqtj6ydd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.04340",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.04340"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Bidirectional schlieren imaging using dual-LED illumination and a lens aperture as a knife-edge",
  "title_text": "Bidirectional schlieren imaging using dual-LED illumination and a lens aperture as a knife-edge",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:17Z",
  "url": "https://research.draconitic.com/paper/cw45xqqtj6ydd",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1364/ol.616609",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}